CN101853099A - Compensation method of touch system - Google Patents
Compensation method of touch system Download PDFInfo
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- CN101853099A CN101853099A CN200910166821A CN200910166821A CN101853099A CN 101853099 A CN101853099 A CN 101853099A CN 200910166821 A CN200910166821 A CN 200910166821A CN 200910166821 A CN200910166821 A CN 200910166821A CN 101853099 A CN101853099 A CN 101853099A
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Abstract
The invention discloses a compensation method of a touch system, which is a compensation method for inputting and sensing an actual working voltage without the correcting the working voltage or constructing a basic linear correction data list. The method comprises the following steps of: (a) switching on a switch of the touch system; (b) initializing the touch system and measuring to obtain a reference frequency output by an oscillator in the touch system; (c) switching off the switch and measuring to obtain a first frequency output by the oscillator; (d) subtracting the first frequency from the reference frequency to obtain a frequency difference value; and (e) comparing the frequency difference value with a predetermined value to judge whether the touch system is touched by an object substance.
Description
Technical field
The present invention relates to a kind of compensation method of touch-control system, the compensation method in particular to the oscillation frequency of touch-control system when influenced.
Background technology
Touch-control system uses various mode to detect user's the behavior of touching, wherein a kind of mode is as back: an oscillator is set, this oscillator can be responded to outside capacitance, outside capacitance is not simultaneously, oscillation frequency (or cycle) difference that promptly can cause oscillator to produce, and touch-control system can be judged user's touching behavior according to the difference of oscillation frequency.But when the operating voltage of touch-control system changed, the oscillation frequency regular meeting of this oscillator changed, and might make this moment touch-control system judge user's behavior by accident.
The touch-control system inside of supposing us has an oscillator, this oscillator can be responded to user's the behavior of pushing, when the user occurs pushing behavior, can make oscillator sense external capacitive, the oscillation frequency of its output is reduced, and touch-control system just can be judged user's push action by the change of oscillator frequency.Operating voltage VDD stablize constant in, system can operate normally; But, when operating voltage is stablized inadequately, just might make touch-control system the situation of erroneous judgement occur if the oscillation frequency of this oscillator can reduce with operating voltage VDD.The oscillation frequency of oscillator also can and then descend when for example descending as if voltage, and this moment, therefore will take for the user had push action because this touch-control system is the push action of judging the user with the reduction of oscillation frequency.
The linear compensation method of a kind of touch-control system of TaiWan, China patent No. I297857 patent disclosure, it makes touch-control system after dispatch from the factory rated operational voltage or setting operating voltage are proofreaied and correct, when importing real work voltage being installed in practical operation touch-control system environment, this linear compensation method carries out the linear compensation Data Update with this real work voltage and rated operational voltage or the voltage difference of setting operating voltage, and more guarantee touch-control system in real work voltage by the piezoelectric field degree of accuracy.Yet this patent still need be set the operating voltage correction and need build and put the substantially linear correction data table and import, detect real work voltage.
Therefore, the present inventor works out a kind of compensation method of touch-control system, compensation method in particular to a kind of oscillation frequency of touch-control system when influenced, it can improve need build in the prior art puts substantially linear correction data table and input, detecting real work voltage to reach the present situation of compensation.
Summary of the invention
The object of the present invention is to provide a kind of compensation method of touch-control system, it need not set operating voltage and proofread and correct and build and put substantially linear correction data table and input, detecting real work voltage and can reach compensation.
The present invention discloses a kind of compensation method of touch system, has its input key mat outside at least more than one switch connection touch-control system of at least one oscillator in this touch-control system, and it comprises:
A) this switch of opening a way;
B) this touch-control system of initialization and measure to such an extent that oscillator is exported a reference frequency;
C) closed circuit this switch and measure to such an extent that oscillator is exported a first frequency;
D) this reference frequency is deducted this first frequency and obtain a frequency-splitting; And
E) this frequency-splitting and a predetermined value are compared, whether contacted by foreign object in order to judge touch-control system.
The present invention also discloses a kind of compensation method of touch system, has at least one reference oscillator and at least one induced oscillation device in this touch-control system, and it comprises:
A) this touch-control system of initialization and measure to such an extent that this reference oscillator is exported a reference frequency;
B) measure to such an extent that this induced oscillation device is exported a first frequency;
C) this reference frequency is deducted this first frequency and obtain a frequency-splitting; And
D) this frequency-splitting and a predetermined value are compared, whether contacted by foreign object in order to judge touch-control system.
The present invention further discloses a kind of compensation method of touch system, has its input key mat outside at least one switch connects touch-control system of at least one oscillator in this touch-control system, and it comprises:
A) closed circuit this switch and measure to such an extent that this oscillator is exported a first frequency;
B) this switch of opening a way, and the most approaching at be coupled in regular turn reference frequency and this first frequency that the impedor of group more than exports this oscillator of the output terminal of this oscillator;
C) closed circuit this switch and measure to such an extent that this oscillator is exported a second frequency;
D) this reference frequency is deducted this second frequency and obtain a frequency-splitting; And
E) this frequency-splitting and a predetermined value are compared, whether contacted, behind a special time, get back to (c) by foreign object in order to judge touch-control system.
The present invention further discloses a kind of compensation method of touch system, has at least one reference oscillator and at least one induced oscillation device in this touch-control system, and it comprises:
A) this touch-control system of initialization and measure to such an extent that this reference oscillator is exported a reference frequency;
B) measure to such an extent that this induced oscillation device is exported a first frequency;
C) output terminal of this reference oscillator or this induced oscillation device is coupled in regular turn reference frequency and this first frequency that the impedor of group more than exports this oscillator is the most approaching;
D) through measuring to such an extent that this induced oscillation device is exported a second frequency after user's formulation time;
E) this reference frequency is deducted this second frequency and obtain a frequency-splitting; And
F) this frequency-splitting and a predetermined value are compared, whether contacted, get back to (d) through another user's formulation time again by foreign object in order to judge touch-control system.
Further understand and approval for those skilled in the art are had for structure purpose of the present invention and effect, now the conjunction with figs. example describe in detail as after.
Description of drawings
Fig. 1 is that oscillator operation voltage is to the oscillation frequency synoptic diagram;
Fig. 2 is that oscillator operation voltage is to another synoptic diagram of oscillation frequency;
Fig. 3 is for being used for method flow synoptic diagram of the present invention;
Fig. 4 is for being used for other method schematic flow sheet of the present invention;
Fig. 5 is the graph of a relation of reference oscillator/induced oscillation device for operating voltage;
Fig. 6 is the graph of a relation of one reference oscillator/induced oscillation device for operating voltage;
Fig. 7 is according to the formed circuit of impedance automatic matching method proposed by the invention;
Fig. 8 is the synoptic diagram of binary search (Binary Search) mode of key diagram 7;
Fig. 9 is the schematic flow sheet about a kind of compensation method of touch system proposed by the invention; And
Figure 10 is the schematic flow sheet about another kind of compensation method of touch system of the present invention.
Wherein, Reference numeral
S301～s305 step
S401～s404 step
S901～s905 step
S1001～s1006 step
Embodiment
For making those skilled in the art further cognitive and understanding be arranged to feature of the present invention, purpose and function, hereinafter the spy describes the relevant thin portion structure of device of the present invention and the theory cause of design, so that those skilled in the art can understand characteristics of the present invention, detailed description is presented below:
When the condenser type oscillator was sensed the external capacitive increase, oscillation frequency can change; And during change in voltage, oscillation frequency also can change.In other words, when oscillation frequency changed, its reason was capacitance change or change in voltage and is difficult for putting in order.
As shown in Figure 1: when the user did not push touch-control system, the oscillation frequency of oscillator and operating voltage pass were the L among Fig. 1
1, fix as if voltage this moment, and the oscillation frequency that oscillator is exported is at the A point, touch-control system then is judgment standard with TH, if oscillation frequency assert then that less than TH such as B point the user has been pressed into touch-control system, though the reason that oscillation frequency order less than TH such as B is because of the operating voltage reduction.
When the user pushes touch-control system, because the approaching of foreign object can make outside inductance capacitance value strengthen.At this moment, oscillation frequency and operating voltage pass is the L among Fig. 1
2, the oscillation frequency that this moment, oscillator was exported is at the AT point.The oscillation frequency of ordering because of AT is smaller or equal to threshold frequency TH, so touch-control system is judged that the user is existing and pushed behavior.
But when the user pushes touch-control system, as the line segment L among Fig. 1
2, raising as if operating voltage, the oscillation frequency that makes oscillator export is moved toward the CT point by the point of the AT among Fig. 1, and this moment, oscillation frequency was higher than TH, so touch-control system promptly can take for no push action generation.
In order to improve this problem, we change the judgment mode of touch-control system, change when adopting a reference frequency to eliminate operating voltage to change the influence to touch-control system.
With reference to figure 2, the reference frequency of reference oscillator is to the relation of operating voltage such as the line segment L among Fig. 2
RLine segment L
1Oscillator frequency is not to the relation of operating voltage when pushing touch-control system for the user of induced oscillation device; Line segment L
2Induced oscillation device frequency is to the relation of operating voltage when having pushed touch-control system for the user.Before operating voltage did not reduce, the reference frequency of reference oscillator was AR, then removed to detect outside inductance capacitance again, before the user does not push touch-control system, the oscillation frequency of induced oscillation device is A, and touch-control system uses the value of AR-A to detect whether outside inductance capacitance is arranged, and the value of AR-A is less than Δ
TH, therefore be judged as outside inductance capacitance.After the user pushed touch-control system, the frequency of induced oscillation device was AT, and touch-control system uses the value of AR-AT to detect whether outside inductance capacitance is arranged, and the value of AR-AT is greater than Δ
TH, therefore judging has outside inductance capacitance, for pushing touch-control system.Can realize that by Fig. 2 those skilled in the art AR-AT equates with BR-BT generally with CR-CT.
Those skilled in the art also can make that induced oscillation device and reference oscillator are essentially same oscillator, at this moment line segment L
RWith line segment L
1When change in voltage, the trend of frequency shift equates generally.
Do not push the user under the situation of touch-control system, if operating voltage reduces, make the reference oscillation frequency of oscillator reduce to BR by AR, do not push the induced oscillation device frequency of touch-control system and reduce to B by A yet this moment, touch-control system uses the value of BR-B to detect whether outside inductance capacitance is arranged, and the value of BR-B is less than Δ
TH, therefore still be judged as outside inductance capacitance.So can solve traditional touch-control system and when voltage drift, judge the problem of user's behavior by accident.The value of BR-BT is greater than Δ
TH, therefore still be judged as outside inductance capacitance.In like manner, if operating voltage raises, make the reference oscillation frequency of oscillator rise to CR by AR, the oscillator frequency that do not push touch-control system this moment also rises to C by A, and touch-control system uses the value of CR-C to detect whether outside inductance capacitance is arranged, and the value of CR-C is less than Δ
TH, therefore still be judged as outside inductance capacitance; The value of CR-CT is greater than Δ
TH, therefore still be judged as outside inductance capacitance.So can solve traditional touch-control system and when voltage drift, judge the problem of user's behavior by accident.
Fig. 3 discloses a kind of compensation method of touch system, has its input key mat outside at least one switch connects touch-control system of at least one oscillator in this touch-control system, and it comprises:
S301: this switch of opening a way;
S302: this touch-control system of initialization is also measured to such an extent that oscillator is exported a reference frequency;
S303: closed circuit this switch is also measured to such an extent that oscillator is exported a first frequency;
S304: this reference frequency is deducted this first frequency obtain a frequency-splitting; And
S305: this frequency-splitting and a predetermined value are compared, whether contacted by foreign object in order to judge touch-control system.
Preferable, wherein said frequency can be the cycle replacement;
Preferable, this method can be applied to eliminating the influence to this touch-control system of temperature, humidity, processing procedure drift and this touch-control system operating voltage; And
Preferable, this method need not carry out reaching compensation by the piezoelectric field correction program on the touch-control system.
Fig. 4 discloses a kind of compensation method of touch system, has at least one reference oscillator and at least one induced oscillation device in this touch-control system, and it comprises:
S401: this touch-control system of initialization is also measured to such an extent that this reference oscillator is exported a reference frequency;
S402: measure to such an extent that this induced oscillation device is exported a first frequency;
S403: this reference frequency is deducted this first frequency obtain a frequency-splitting; And
S404: this frequency-splitting and a predetermined value are compared, whether contacted by foreign object in order to judge touch-control system.
Preferable, wherein said frequency can be the cycle replacement;
Preferable, this method can be applied to eliminating the influence to this touch-control system of temperature, humidity, processing procedure drift and this touch-control system operating voltage;
Preferable, wherein this induced oscillation device its through at least more than one switch connect touch-control system outer one import key mat; And
Preferable, this method need not carry out reaching compensation by the piezoelectric field correction program on the touch-control system.
Those skilled in the art also can know by inference, obtain oscillator reference frequency and outside induction frequencies and are regardless of order successively, can carry out simultaneously, also can one in front and one in back carry out.And reference frequency and outside induction frequencies can be produced by same oscillator, for example with one of oscillator outer setting or several switches, when switch during for open circuit, can obtain reference frequency, and arbitrary or several switches when closed circuit, can be responded to external action.
When number percent that changes along with change in voltage when reference oscillation frequency and induced oscillation frequency or trend are identical, the disclosed compensation method of touch system of Fig. 4 can solve the problem of touch-control system erroneous judgement user behavior smoothly, but when if number percent that reference oscillation frequency and induced oscillation frequency change along with change in voltage or trend are also inequality, the situation of erroneous judgement still can exist in the touch-control system, as shown in Figure 5.
Judgment standard among Fig. 5 still is Δ F
A+ F
TH, when voltage at V
AThe time, reference frequency is F
AR, then go again to detect outside inductance capacitance, before the user did not touch touch-control system, the oscillation frequency of oscillator was F
A, touch-control system uses F
AR-F
AValue detect whether touch-control system, F are arranged
AR-F
AValue be Δ F
A, less than judgment standard Δ F
A+ F
TH, therefore be judged as and do not touch touch-control system.After the user touched touch-control system, the frequency of oscillator was F
AT, touch-control system uses F
AR-F
ATValue be designated as Δ F
AT, greater than judgment standard Δ F
A+ F
TH, therefore be judged as and touch touch-control system.
But when voltage is V
BThe time, not touch the user under the situation of touch-control system, the reference oscillation frequency of oscillator is by F
ARReduce to F
BR, do not touch the oscillator frequency of touch-control system by F this moment yet
AReduce to F
B, touch-control system uses F
BR-F
BValue detect whether the touching touch-control system is arranged, as Fig. 5, F
BR-F
BValue greater than judgment standard point Δ F
A+ F
TH, so touch-control system has takeed for the touch action generation.Opposite, when voltage than V
AWhen high, then to have touched under the situation of touch-control system as the user, touch-control system but might take for does not have touch action to take place.
Hence one can see that, number percent that changes along with change in voltage when reference oscillation frequency and induced oscillation frequency or trend not simultaneously, touch-control system still has the possibility of erroneous judgement.And for producing the oscillator of reference oscillation frequency or induced oscillation frequency, influence the impedance that its outside is seen that is of its frequency and voltage relationship, therefore if external impedance equates that then the number percent that changes along with change in voltage of reference oscillation frequency and induced oscillation frequency or trend are also can convergence identical.Therefore, the method that the present invention is further mated automatically about a kind of impedance is in the hope of allowing reference oscillation frequency keep consistent with the change curve of induced oscillation frequency.
Fig. 6 illustrates the graph of a relation of one reference oscillator/induced oscillation device for operating voltage, wherein, and Z
RExpression is by the reference oscillation frequency that reference oscillator produced and the relation of operating voltage, Z
SThe induced oscillation frequency that expression is produced by the induced oscillation device and the relation of operating voltage, and reference oscillator and induced oscillation device can be same oscillator and switch through different switches and obtain, and the oscillator that is respectively different is also arranged.And no matter induced oscillation device or reference oscillator, the oscillation frequency of its generation is relevant with the impedance that it is connected with the relation of operating voltage.
Therefore, in a preferred embodiment of the present invention, in order to allow the induced oscillation device and the impedance one of reference oscillator show number percent or the different situation of trend that minimizing causes reference oscillation frequency and induced oscillation frequency to change along with change in voltage because of different impedances, we are oscillator and the correct of outside junction therein, as shown in Figure 7, promptly be according to the formed circuit of impedance automatic matching method proposed by the invention in the frame of broken lines.
Further specifying of Fig. 7 is as follows: we must add several switches and impedor in oscillator and outer member junction, and preferable, the impedor among Fig. 7 is realized with electric capacity, but is not limited to electric capacity.Before carrying out the automatic coupling of impedance, the variation tendency of oscillator during to different impedance magnitude should be measured in advance, and this can be learnt by simulation, also can be learnt by experiment, can also detect voluntarily when being connected to impedor on the oscillator by circuit, observe its frequency change and know.After system start-up, just can carry out the impedance action of coupling automatically,, just can adjust a reference oscillation frequency and the approaching result of induced oscillation frequency impedance by the combination of switch group Push And Release.
Fig. 8 is binary search (Binary Search) mode of key diagram 7, and it can be for finding out optimum matching point.Whether suppose the impedance automatic matching method is implemented on the reference oscillator, at first we connect the electric capacity of 8pF, and all the other electric capacity disconnect, and the speed speed of reference oscillation frequency and induced oscillation frequency relatively, with decision 8pF after the line; Then the switch of 8pF remains unchanged, again 4pF electric capacity is connected, the following electric capacity of 2pF disconnects, and the speed speed of comparison reference oscillation frequency and induced oscillation frequency, whether decision 4pF line, so accomplish minimum impedance, promptly can finish the program of automatic impedance coupling, as shown in Figure 8 by the impedance of maximum.Because we will allow reference oscillator mate through mode and the induced oscillation device that increases electric capacity, it is big that capacitance when therefore our all switches of capacity ratio reference oscillator that must allow the induced oscillation device be had are all open circuit comes, and so just can finish the action of impedance matching.If the capacitance of induced oscillation device end is too big, even still can't mate after causing all electric capacity in the automatic match circuit originally all to connect, can externally connect one group of electric capacity voluntarily this moment by the user, but so just can allow the automatic match circuit normal operation.And IC inside also can add the fixed capacity of switching without switch, and it is identical that its function and user externally connect electric capacity voluntarily.
When described impedance auto-match circuit is applied in reference oscillator, the present invention also can be mated different induced oscillation frequencies respectively, suppose that the induced oscillation frequency has 16 groups, because the pairing impedance of each induced oscillation frequency is also inequality, therefore can mate the induced oscillation frequency of different groups respectively, and when using different induced oscillation frequencies, control the impedance matching switch of reference oscillator automatically, different induced oscillation devices can be similar to the reference oscillator impedance.
Fig. 9 is about an aspect of the present invention, it illustrates a kind of compensation method of touch system, have its input key mat outside at least one switch connects touch-control system of at least one oscillator in this touch-control system, it comprises: s901: closed circuit this switch is also measured to such an extent that this oscillator is exported a first frequency; S902: this switch of opening a way, and the most approaching at be coupled in regular turn reference frequency and this first frequency that the impedor of group more than exports this oscillator of the output terminal of this oscillator; S903: closed circuit this switch is also measured to such an extent that this oscillator is exported a second frequency; S904: this reference frequency is deducted this second frequency obtain a frequency-splitting; And s905: this frequency-splitting and a predetermined value are compared, whether contacted, behind a special time, get back to s903 by foreign object in order to judge touch-control system.
Figure 10 is about another aspect of the present invention, it illustrates a kind of compensation method of touch system, have at least one reference oscillator and at least one induced oscillation device in this touch-control system, it comprises: s1001: this touch-control system of initialization is also measured to such an extent that this reference oscillator is exported a reference frequency; S1002: measure to such an extent that this induced oscillation device is exported a first frequency; S1003: be coupled in regular turn reference frequency and this first frequency that the impedor of group more than exports this oscillator of an output terminal of this reference oscillator is the most approaching; S1004: through measuring to such an extent that this induced oscillation device is exported a second frequency after user's formulation time; S1005: this reference frequency is deducted this second frequency obtain a frequency-splitting; And s1006: this frequency-splitting and a predetermined value are compared, whether contacted, get back to s1004 through another user's formulation time again by foreign object in order to judge touch-control system.
The above automatic matching method of carrying can be realized at the reference oscillator end, also can realize at induced oscillation device end, all in this patent institute announcement scope.This invention can be applicable to use reference oscillation frequency and induction concussion frequency to detect the touch-control system of touch-control action, and all those skilled in the art all can understand, and do not repeat them here.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (15)
1. a compensation method of touch system is characterized in that, has at least one oscillator in this touch-control system, its input key mat outside at least one switch connects touch-control system, and it comprises:
A) this switch of opening a way;
B) this touch-control system of initialization and measure to such an extent that described oscillator is exported a reference frequency;
C) closed circuit this switch and measure to such an extent that described oscillator is exported a first frequency;
D) this reference frequency is deducted this first frequency and obtain a frequency-splitting; And
E) this frequency-splitting and a predetermined value are compared, whether contacted by foreign object in order to judge this touch-control system.
2. method according to claim 1 is characterized in that, described frequency can be the cycle replacement.
3. method according to claim 1 is characterized in that, it can be applied to eliminating the influence to this touch-control system of temperature, humidity, processing procedure drift and this touch-control system operating voltage.
4. method according to claim 1 is characterized in that, it need not carry out reaching compensation by the piezoelectric field correction program on the touch-control system.
5. a compensation method of touch system is characterized in that, has at least one reference oscillator and at least one induced oscillation device in this touch-control system, and it comprises:
A) this touch-control system of initialization and measure to such an extent that this reference oscillator is exported a reference frequency;
B) measure to such an extent that this induced oscillation device is exported a first frequency;
C) this reference frequency is deducted this first frequency and obtain a frequency-splitting; And
D) this frequency-splitting and a predetermined value are compared, whether contacted by foreign object in order to judge this touch-control system.
6. method according to claim 5 is characterized in that, described frequency can be the cycle replacement.
7. method according to claim 5 is characterized in that, it can be applied to eliminating the influence to this touch-control system of temperature, humidity, processing procedure drift and this touch-control system operating voltage.
8. method according to claim 5 is characterized in that, it need not carry out reaching compensation by the piezoelectric field correction program on the touch-control system.
9. method according to claim 5 is characterized in that, the input key mat of this induced oscillation device outside at least more than one switch connects touch-control system.
10. a compensation method of touch system is characterized in that, has at least one oscillator in this touch-control system, its input key mat outside at least one switch connects touch-control system, and it comprises:
A) closed circuit this switch and measure to such an extent that this oscillator is exported a first frequency;
B) this switch of opening a way, and the most approaching at be coupled in regular turn reference frequency and this first frequency that the impedor of group more than exports this oscillator of the output terminal of this oscillator;
C) closed circuit this switch and measure to such an extent that this oscillator is exported a second frequency;
D) this reference frequency is deducted this second frequency and obtain a frequency-splitting; And
E) this frequency-splitting and a predetermined value are compared, whether contacted, behind a special time, get back to step c by foreign object in order to judge this touch-control system.
11. method according to claim 10 is characterized in that, the impedors of described many groups further comprise group more than one switch its being connected to resistor, capacitor or the inductor of organizing more.
12. method according to claim 11 is characterized in that, the capacitors of described many groups it make the most approaching value of this reference frequency and this first frequency find through the binary search method.
13. a compensation method of touch system is characterized in that, has at least one reference oscillator and at least one induced oscillation device in this touch-control system, it comprises:
A) this touch-control system of initialization and measure to such an extent that this reference oscillator is exported a reference frequency;
B) measure to such an extent that this induced oscillation device is exported a first frequency;
C) output terminal of this reference oscillator is coupled in regular turn reference frequency and this first frequency that the impedor of group more than exports this oscillator is the most approaching;
D) through measuring to such an extent that this induced oscillation device is exported a second frequency after user's formulation time;
E) this reference frequency is deducted this second frequency and obtain a frequency-splitting; And
F) this frequency-splitting and a predetermined value are compared, whether contacted, get back to steps d through another user's formulation time again by foreign object in order to judge this touch-control system.
14. method according to claim 13 is characterized in that, the impedors of described many groups further comprise group more than one switch its being connected to resistor, capacitor or the inductor of organizing more.
15. method according to claim 11 is characterized in that, the capacitors of described many groups it make the most approaching value of this reference frequency and this first frequency find through the binary search method.
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|---|---|---|---|
| CN2009101668211A CN101853099B (en) | 2009-03-30 | 2009-08-31 | Compensation method of touch system |
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|---|---|---|---|
| CN200910132642.6 | 2009-03-30 | ||
| CN200910132642 | 2009-03-30 | ||
| CN2009101668211A CN101853099B (en) | 2009-03-30 | 2009-08-31 | Compensation method of touch system |
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| CN101853099B CN101853099B (en) | 2012-03-28 |
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| CN103294243A (en) * | 2012-03-05 | 2013-09-11 | 联想(北京)有限公司 | Method for adjusting environmental parameter of touch sense unit and related device thereof. |
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| CN103378838A (en) * | 2012-04-11 | 2013-10-30 | 福特全球技术公司 | Proximity switch assembly and activation method |
| US10038443B2 (en) | 2014-10-20 | 2018-07-31 | Ford Global Technologies, Llc | Directional proximity switch assembly |
| US9654103B2 (en) | 2015-03-18 | 2017-05-16 | Ford Global Technologies, Llc | Proximity switch assembly having haptic feedback and method |
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